`@Kem`
`1.→` I haven't seen Lan since Tam's birthday party.
`2.→` The last time I wen to English was last year.
`3.→` It last rained a long time ago.
`4.→` Henry hasn't smoked any cigarette since 2005.
`5.→` They haven't lived here for ten years.
`6.→` We have learned English since last month.
`7.→` An has been interested in healthy eating for 3 years.
`8.→` I haven't met Bob since I was in Ho Chi Minh City.
`9.→` She hasn't gone with him since 1995.
`10.→` Ha started doing her homework an hour ago.
